linux-kernel - Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible

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Date:	Wed, 23 Jan 2013 16:45:12 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Simon Jeons <simon.jeons@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Hugh Dickins <hughd@...gle.com>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible

> Good question.
>
> There are 19 free bits in my configuration but it's related to
> CONFIG_NODES_SHIFT which is 9 for me (512 nodes) and very heavily affected
> by options such as CONFIG_SPARSEMEM_VMEMMAP. Memory hot-remove does not work
> with CONFIG_SPARSEMEM_VMEMMAP and enterprise distribution configs may be
> taking the performance hit to enable memory hot-remove. If I disable this
> option to enable memory hot-remove then there are 0 free bits in page->flags.

FWIW, when using current mmotm, memory hot memory remove does work w/
CONFIG_SPARSEMEM_VMEMMAP. Recently Fujitsu changed.
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